Less Is More
It sounds all wrongdrilling holes in a piece of wood to make it more resistant to knocks. But it works because the energy from the blow gets distributed throughout the wood rather than focusing on one weak spot. The discovery should lead to more effective and lighter packaging materials.
Carpenters have known centuries that some woods are tougher than others. Hickory , for example, was turned into axe handles and cartwheel spokes because it can absorb shocks without breaking. White oak, for example, is much more easily damaged it is almost as dense. Julian Vincent at Bathe University and his team were convinced the woods internal structure could explain the differences.
Many trees have tubular vessels that run the trunk and carry water to the leaves. In oak they are large, and arranged in narrow bands, but in hickory they are smaller, and more evenly distributed. The researchers this layout might distribute a blows energy throughout the wood, soaking up a bigger hit. To test the idea, they drilled holes 0.65 millimetres across into a block of spruce , a wood with vessels, and found that withstood a harder knock. when there were more than about 30 holes per square centimetre did the woods performance drop off.
A uniform substance doesnt cope well with knocks because only a small proportion of the material is actually . All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left are pristine .
But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. You are controlling the places the wood breaks, and it can then absorb more , more safely.
The researchers believe the principle could be applied to any material- example, to manufacture lighter and more protective packaging. It could be used in car bumpers, crash barriers and armour for military vehicles, says Ulrike Wegst, the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you to design the substance with the direction of force in mind. The direction of loading is crucial, she says.
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【参考答案】
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